Marine vessel



Patented Jan. 15, 1924..

HERMANN GUSTAV CARL FRAHM, F HAJVIBURG, GERMANY.

MARINE VESSEL.

Application filed January 24, 1922. Serial No. 531,514.

To all whom it may concern:

Be it known that I HERMANN GUSTAV CARL FRAHM, a citizen of Germany, anda resident of Hamburg, Germany, have inc vented certain new and usefulImprovements in Marine Vessels, of which the following i aspecification.

This invention relates to marine vessels and has for its object toprovide improved H means for damping the rolling motion,

whereby also the stability of the vessel is increased, even when thevessel is not laden,

without decreasing the hold capacity of the vessel.

According to the present invention the side plating of the vessel iscurved outwardly between the deck height and the bilge to accommodateanti-rolling chambers in the space formed between the side plating andthe chord of curvature or a vertical plane passing through the upperstrakes or the side plating. The centre of curvature is situatedsubstantially on the normal water line of the vessel. The outer wall ofthe anti-rolling chamber at each side of the vessel is preferablyconstituted by the side plating, which is suitably perforated to providefor ingress and egress of water, the rat-er chamber bein enclosed on itsinner side by suitable longitudinal bulkheads located on or outside thechord of curvature or vertical plane of the upper strakes of the sideplating. By this hold space and the breadth of the vessel increased,thereby increasing its stability. The br adth of the vessel is alsoincreased below the minimum draught water line of the vessel so that thestability of the vessel is increased even when the vessel is not laden.The arrangement also enables the provision of additional hold spacebelow the anti-rolling chambers.

On the drawing annexed, a half midshipsection of a marine vessel isillustrated showing the application of the present invention.

The normal hold space of the vessel is laterally determined by the planeAB.' 59 According to the present invention the side plating of thevessel is curved outwardly at a between the upper strakes 7) and thebilge 0 to accommodate an anti-rolling chamber in the space formedbetween the plane AB construction the anti-rolling, chambers are locatedoutside the normal and the curved side a. The side plating it forms theouter wall of the chamber (1 and is perforated at e for the ingress andegress of water. The chamber (Z is enclosed on its inner side bylongitudinal bulkheads f, g and h, the bulkhead f being preferably justoutside the plane A+-B as shown It will be readily seen from the drawingthat the curve or protuberance a is an in-' tegral part of the 'shipssideplating and that it is disposed about the-mean draught water line Cand below the minimum draught water line D so that, when the vessel isempty and floating at the water line D, the

stability of the vessel will still be increased. It will also be seenthat, instead of encroaching on the normal hold space, additional holdspace is provided beneath the bulkhead g. I

The upper portions of the water chambers (Z may be cross-connected by apipe con trolled by a valve Z.

Claims- 1. A marine vessel having its main platingcurved outwardlybetween the deck height and bilge, the centre of curvature beingsubstantially on the normal water lineof the vessel, a longitudinalbulkhead fitted I internally to said main plating so as to en close aspace between the curved plating and bulkhead and apertures in saidcurved plating for the free ingress and egress of water'to and from saidspace.

2. A marine vessel having its main plating curved outwardly between thedeck height and bilge, the centre of curvature being substantially onthe normal water line signature.

HERM. FRAHM. Ls

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